quick wiring question from everyone please help!!!!!

ok i own a 91 civic hatch dx swap to a d16y8 got my mfi kit has all sensors resitor box everything now when i baught it also got a si harness for everything under the hood now will it plug into my dx harness that goes into my ecu an also will it plug into all my stuff under the hood like alternator ect....?i allready know i gotta get a pm6 ecu an dizzy put after that will everything plug into my dx shyt?

not sure exactly what you are asking. but always modify the stock harness